她在洗澡时喜欢唱歌。

She loves to ___sing while taking a shower.

水壶在水沸腾时会发出响亮的声音。

The kettle ___sings loudly when the water is boiling.

那个小偷向警方坦白，供出了同伙的藏身处。

The thief ___sings to the police, revealing his partners' hideouts.